]> git.baikalelectronics.ru Git - kernel.git/commit
platform/x86: intel_pmc_ipc: Use spin_lock to protect GCR updates
authorKuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Sat, 7 Oct 2017 22:19:51 +0000 (15:19 -0700)
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Mon, 23 Oct 2017 17:17:49 +0000 (20:17 +0300)
commite3075fd6f80c9a6ce678fa2f5bbdb2824c506c6c
treeefd5fbce592a23485de2f9e8888915dd6fb53175
parenta5e50220edbdd1ec8912c191a0f5272d629743bf
platform/x86: intel_pmc_ipc: Use spin_lock to protect GCR updates

Currently, update_no_reboot_bit() function implemented in this driver
uses mutex_lock() to protect its register updates. But this function is
called with in atomic context in iTCO_wdt_start() and iTCO_wdt_stop()
functions in iTCO_wdt.c driver, which in turn causes "sleeping into
atomic context" issue. This patch fixes this issue by replacing the
mutex_lock() with spin_lock() to protect the GCR read/write/update APIs.

Fixes: 9d855d4 ("platform/x86: intel_pmc_ipc: Fix iTCO_wdt GCS memory mapping failure")
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kupuswamy@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
drivers/platform/x86/intel_pmc_ipc.c