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param: simple locking for sysfs-writable charp parameters
Since the writing to sysfs can free the old one, we need to block that when we access the charp variables. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Dan Williams <dcbw@redhat.com> Cc: John W. Linville <linville@tuxdriver.com> Cc: Jing Huang <huangj@brocade.com> Cc: James E.J. Bottomley <James.Bottomley@suse.de> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: David S. Miller <davem@davemloft.net> Cc: user-mode-linux-devel@lists.sourceforge.net Cc: libertas-dev@lists.infradead.org Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: linux-usb@vger.kernel.org
This commit is contained in:
parent
dca4130639
commit
d6d1b650ae
7 changed files with 24 additions and 0 deletions
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@ -187,7 +187,9 @@ static int hostaudio_open(struct inode *inode, struct file *file)
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int ret;
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#ifdef DEBUG
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kparam_block_sysfs_write(dsp);
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printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
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kparam_unblock_sysfs_write(dsp);
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#endif
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state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
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@ -199,9 +201,11 @@ static int hostaudio_open(struct inode *inode, struct file *file)
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if (file->f_mode & FMODE_WRITE)
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w = 1;
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kparam_block_sysfs_write(dsp);
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lock_kernel();
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ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
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unlock_kernel();
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kparam_unblock_sysfs_write(dsp);
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if (ret < 0) {
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kfree(state);
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@ -258,13 +262,17 @@ static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
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if (file->f_mode & FMODE_WRITE)
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w = 1;
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kparam_block_sysfs_write(mixer);
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lock_kernel();
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ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
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unlock_kernel();
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kparam_unblock_sysfs_write(mixer);
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if (ret < 0) {
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kparam_block_sysfs_write(dsp);
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printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
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"err = %d\n", dsp, -ret);
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kparam_unblock_sysfs_write(dsp);
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kfree(state);
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return ret;
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}
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@ -320,8 +328,10 @@ MODULE_LICENSE("GPL");
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static int __init hostaudio_init_module(void)
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{
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__kernel_param_lock();
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printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
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dsp, mixer);
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__kernel_param_unlock();
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module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
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if (module_data.dev_audio < 0) {
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@ -289,10 +289,13 @@ static int if_usb_probe(struct usb_interface *intf,
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}
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/* Upload firmware */
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kparam_block_sysfs_write(fw_name);
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if (__if_usb_prog_firmware(cardp, lbs_fw_name, BOOT_CMD_FW_BY_USB)) {
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kparam_unblock_sysfs_write(fw_name);
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lbs_deb_usbd(&udev->dev, "FW upload failed\n");
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goto err_prog_firmware;
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}
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kparam_unblock_sysfs_write(fw_name);
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if (!(priv = lbs_add_card(cardp, &udev->dev)))
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goto err_prog_firmware;
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@ -811,12 +811,15 @@ static int if_usb_prog_firmware(struct if_usb_card *cardp)
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lbtf_deb_enter(LBTF_DEB_USB);
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kparam_block_sysfs_write(fw_name);
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ret = request_firmware(&cardp->fw, lbtf_fw_name, &cardp->udev->dev);
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if (ret < 0) {
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pr_err("request_firmware() failed with %#x\n", ret);
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pr_err("firmware %s not found\n", lbtf_fw_name);
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kparam_unblock_sysfs_write(fw_name);
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goto done;
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}
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kparam_unblock_sysfs_write(fw_name);
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if (check_fwfile_format(cardp->fw->data, cardp->fw->size))
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goto release_fw;
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@ -788,6 +788,7 @@ bfad_drv_init(struct bfad_s *bfad)
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memset(&driver_info, 0, sizeof(driver_info));
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strncpy(driver_info.version, BFAD_DRIVER_VERSION,
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sizeof(driver_info.version) - 1);
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__kernel_param_lock();
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if (host_name)
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strncpy(driver_info.host_machine_name, host_name,
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sizeof(driver_info.host_machine_name) - 1);
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@ -797,6 +798,7 @@ bfad_drv_init(struct bfad_s *bfad)
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if (os_patch)
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strncpy(driver_info.host_os_patch, os_patch,
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sizeof(driver_info.host_os_patch) - 1);
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__kernel_param_unlock();
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strncpy(driver_info.os_device_name, bfad->pci_name,
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sizeof(driver_info.os_device_name - 1));
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@ -1577,6 +1577,7 @@ static void cmvs_file_name(struct uea_softc *sc, char *const cmv_name, int ver)
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char file_arr[] = "CMVxy.bin";
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char *file;
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kparam_block_sysfs_write(cmv_file);
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/* set proper name corresponding modem version and line type */
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if (cmv_file[sc->modem_index] == NULL) {
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if (UEA_CHIP_VERSION(sc) == ADI930)
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@ -1595,6 +1596,7 @@ static void cmvs_file_name(struct uea_softc *sc, char *const cmv_name, int ver)
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strlcat(cmv_name, file, UEA_FW_NAME_MAX);
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if (ver == 2)
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strlcat(cmv_name, ".v2", UEA_FW_NAME_MAX);
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kparam_unblock_sysfs_write(cmv_file);
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}
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static int request_cmvs_old(struct uea_softc *sc,
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@ -726,7 +726,9 @@ static int __devinit vt8623_pci_probe(struct pci_dev *dev, const struct pci_devi
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/* Prepare startup mode */
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kparam_block_sysfs_write(mode_option);
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rc = fb_find_mode(&(info->var), info, mode_option, NULL, 0, NULL, 8);
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kparam_unblock_sysfs_write(mode_option);
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if (! ((rc == 1) || (rc == 2))) {
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rc = -EINVAL;
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dev_err(info->device, "mode %s not found\n", mode_option);
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@ -103,6 +103,7 @@ ieee80211_rate_control_ops_get(const char *name)
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struct rate_control_ops *ops;
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const char *alg_name;
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kparam_block_sysfs_write(ieee80211_default_rc_algo);
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if (!name)
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alg_name = ieee80211_default_rc_algo;
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else
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@ -120,6 +121,7 @@ ieee80211_rate_control_ops_get(const char *name)
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/* try built-in one if specific alg requested but not found */
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if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT))
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ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
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kparam_unblock_sysfs_write(ieee80211_default_rc_algo);
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return ops;
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}
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