e81478bbe7
Fix a corner case between PCI device driver remove callback and
runtime PM idle callback.
Following sequence of events can happen:
- at azx_create, context is allocated with devm_kzalloc() and
stored as pci_set_drvdata()
- user-space requests to unbind audio driver
- dd.c:__device_release_driver() calls PCI remove
- pci-driver.c:pci_device_remove() calls the audio
driver azx_remove() callback and this is completed
- pci-driver.c:pm_runtime_put_sync() leads to a call
to rpm_idle() which again calls azx_runtime_idle()
- the azx context object, as returned by dev_get_drvdata(),
is no longer valid
-> access fault in azx_runtime_idle when executing
struct snd_card *card = dev_get_drvdata(dev);
chip = card->private_data;
if (chip->disabled || hda->init_failed)
This was discovered by i915_module_load test with 5.15.0 based
linux-next tree.
Example log caught by i915_module_load test with linux-next
https://intel-gfx-ci.01.org/tree/linux-next/
<4> [264.038232] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b73f0: 0000 [#1] PREEMPT SMP NOPTI
<4> [264.038248] CPU: 0 PID: 5374 Comm: i915_module_loa Not tainted 5.15.0-next-20211109-gc8109c2ba35e-next-20211109 #1
[...]
<4> [264.038267] RIP: 0010:azx_runtime_idle+0x12/0x60 [snd_hda_intel]
[...]
<4> [264.038355] Call Trace:
<4> [264.038359] <TASK>
<4> [264.038362] __rpm_callback+0x3d/0x110
<4> [264.038371] rpm_idle+0x27f/0x380
<4> [264.038376] __pm_runtime_idle+0x3b/0x100
<4> [264.038382] pci_device_remove+0x6d/0xa0
<4> [264.038388] device_release_driver_internal+0xef/0x1e0
<4> [264.038395] unbind_store+0xeb/0x120
<4> [264.038400] kernfs_fop_write_iter+0x11a/0x1c0
Fix the issue by setting drvdata to NULL at end of azx_remove().
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20211110210307.1172004-1-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
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| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
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| Makefile | ||
| README | ||
README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.