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Char/misc driver fixes for 4.10-rc7
Here are two bugfixes that resolve some reported issues. One in the firmware loader, that should fix the much-reported problem of crashes with it. The other is a hyperv fix for a reported regression. Both have been in linux-next for a week or so with no reported issues. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCWJWsGA8cZ3JlZ0Brcm9h aC5jb20ACgkQMUfUDdst+ylWmwCgjvg9SImQDY2FKYNAOhQnBh9gtXUAn0Gux/KD yzqEsG5BOmjD3YcYGsx6 =VzHo -----END PGP SIGNATURE----- Merge tag 'char-misc-4.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc driver fixes from Greg KH: "Here are two bugfixes that resolve some reported issues. One in the firmware loader, that should fix the much-reported problem of crashes with it. The other is a hyperv fix for a reported regression. Both have been in linux-next for a week or so with no reported issues" * tag 'char-misc-4.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read() firmware: fix NULL pointer dereference in __fw_load_abort()
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commit
412e6d3fec
4 changed files with 38 additions and 6 deletions
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@ -558,9 +558,6 @@ static void fw_load_abort(struct firmware_priv *fw_priv)
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struct firmware_buf *buf = fw_priv->buf;
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__fw_load_abort(buf);
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/* avoid user action after loading abort */
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fw_priv->buf = NULL;
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}
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static LIST_HEAD(pending_fw_head);
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@ -713,7 +710,7 @@ static ssize_t firmware_loading_store(struct device *dev,
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mutex_lock(&fw_lock);
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fw_buf = fw_priv->buf;
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if (!fw_buf)
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if (fw_state_is_aborted(&fw_buf->fw_st))
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goto out;
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switch (loading) {
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@ -383,6 +383,7 @@ int hv_ringbuffer_read(struct vmbus_channel *channel,
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return ret;
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}
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init_cached_read_index(channel);
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next_read_location = hv_get_next_read_location(inring_info);
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next_read_location = hv_copyfrom_ringbuffer(inring_info, &desc,
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sizeof(desc),
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@ -1295,6 +1295,9 @@ void netvsc_channel_cb(void *context)
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ndev = hv_get_drvdata(device);
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buffer = get_per_channel_state(channel);
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/* commit_rd_index() -> hv_signal_on_read() needs this. */
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init_cached_read_index(channel);
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do {
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desc = get_next_pkt_raw(channel);
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if (desc != NULL) {
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@ -1347,6 +1350,9 @@ void netvsc_channel_cb(void *context)
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bufferlen = bytes_recvd;
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}
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init_cached_read_index(channel);
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} while (1);
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if (bufferlen > NETVSC_PACKET_SIZE)
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@ -128,6 +128,7 @@ struct hv_ring_buffer_info {
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u32 ring_data_startoffset;
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u32 priv_write_index;
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u32 priv_read_index;
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u32 cached_read_index;
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};
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/*
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@ -180,6 +181,19 @@ static inline u32 hv_get_bytes_to_write(struct hv_ring_buffer_info *rbi)
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return write;
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}
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static inline u32 hv_get_cached_bytes_to_write(
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const struct hv_ring_buffer_info *rbi)
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{
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u32 read_loc, write_loc, dsize, write;
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dsize = rbi->ring_datasize;
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read_loc = rbi->cached_read_index;
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write_loc = rbi->ring_buffer->write_index;
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write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
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read_loc - write_loc;
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return write;
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}
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/*
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* VMBUS version is 32 bit entity broken up into
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* two 16 bit quantities: major_number. minor_number.
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@ -1488,7 +1502,7 @@ hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
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static inline void hv_signal_on_read(struct vmbus_channel *channel)
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{
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u32 cur_write_sz;
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u32 cur_write_sz, cached_write_sz;
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u32 pending_sz;
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struct hv_ring_buffer_info *rbi = &channel->inbound;
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@ -1512,12 +1526,24 @@ static inline void hv_signal_on_read(struct vmbus_channel *channel)
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cur_write_sz = hv_get_bytes_to_write(rbi);
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if (cur_write_sz >= pending_sz)
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if (cur_write_sz < pending_sz)
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return;
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cached_write_sz = hv_get_cached_bytes_to_write(rbi);
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if (cached_write_sz < pending_sz)
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vmbus_setevent(channel);
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return;
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}
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static inline void
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init_cached_read_index(struct vmbus_channel *channel)
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{
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struct hv_ring_buffer_info *rbi = &channel->inbound;
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rbi->cached_read_index = rbi->ring_buffer->read_index;
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}
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/*
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* An API to support in-place processing of incoming VMBUS packets.
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*/
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@ -1569,6 +1595,8 @@ static inline void put_pkt_raw(struct vmbus_channel *channel,
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* This call commits the read index and potentially signals the host.
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* Here is the pattern for using the "in-place" consumption APIs:
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*
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* init_cached_read_index();
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*
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* while (get_next_pkt_raw() {
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* process the packet "in-place";
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* put_pkt_raw();
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