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| author | Himanshu Madhani <himanshu.madhani@oracle.com> | 2025-07-09 01:25:30 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-07-11 00:41:08 +0300 |
| commit | 68ea85df15d111d82fc474cbe104174791169355 (patch) | |
| tree | 37debc5017299a084aed7409a9e26e0cfed47476 /lib/string_helpers.c | |
| parent | d7b8f8e20813f0179d8ef519541a3527e7661d3a (diff) | |
| download | linux-68ea85df15d111d82fc474cbe104174791169355.tar.xz | |
PCI/MSI: Prevent recursive locking in pci_msix_write_tph_tag()
pci_msix_write_tph_tag() takes the per device MSI descriptor mutex and then
invokes msi_domain_get_virq(), which takes the same mutex again. That
obviously results in a system hang which is exposed by a softlockup or
lockdep warning.
Move the lock guard after the invocation of msi_domain_get_virq() to fix
this.
[ tglx: Massage changelog by adding a proper explanation and removing the
not really useful stacktrace ]
Fixes: d5124a9957b2 ("PCI/MSI: Provide a sane mechanism for TPH")
Reported-by: Jorge Lopez <jorge.jo.lopez@oracle.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jorge Lopez <jorge.jo.lopez@oracle.com>
Link: https://lore.kernel.org/all/20250708222530.1041477-1-himanshu.madhani@oracle.com
Diffstat (limited to 'lib/string_helpers.c')
0 files changed, 0 insertions, 0 deletions