From: Rakib Mullick Date: Sun, 6 Nov 2011 15:18:17 +0000 (+0600) Subject: ACPI: Fix possible recursive locking in hwregs.c X-Git-Tag: v3.2-rc1~10^2~1^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7f71cfbf0c276ee3d8d856d0f35a41aed997fa4;p=pandora-kernel.git ACPI: Fix possible recursive locking in hwregs.c Calling pm-suspend might trigger a recursive lock in it's code path. In function acpi_hw_clear_acpi_status, acpi_os_acquire_lock holds the lock acpi_gbl_hardware_lock before calling acpi_hw_register_write(), then without releasing acpi_gbl_hardware_lock, this function calls acpi_ev_walk_gpe_list, which tries to hold acpi_gbl_gpe_lock. Both acpi_gbl_hardware_lock and acpi_gbl_gpe_lock are at same lock-class and which might cause lock recursion deadlock. Following patch fixes this scenario by just releasing acpi_gbl_hardware_lock before calling acpi_ev_walk_gpe_list. Changes since v0(https://lkml.org/lkml/2011/9/21/355): - Fix changelog, thanks to Lin Ming. Changes since v1 (https://lkml.org/lkml/2011/11/3/89): - Update changelog and rename goto label, courtesy Srivatsa S. Bhat. Signed-off-by: Rakib Mullick Reviewed-by: Srivatsa S. Bhat Acked-by: Rafael J. Wysocki Signed-off-by: Len Brown --- Reading git-diff-tree failed