6.12-stable review patch. If anyone has any objections, please let me know.
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From: David E. Box david.e.box@linux.intel.com
[ Upstream commit 1d7461d0c8330689117286169106af6531a747ed ]
In pmc_core_ssram_get_pmc(), the physical addresses for hidden SSRAM devices are retrieved from the MMIO region of the primary SSRAM device. If additional devices are not present, the address returned is zero. Currently, the code does not check for this condition, resulting in ioremap() incorrectly attempting to map address 0.
Add a check for a zero address and return 0 if no additional devices are found, as it is not an error for the device to be absent.
Fixes: a01486dc4bb1 ("platform/x86/intel/pmc: Cleanup SSRAM discovery") Signed-off-by: David E. Box david.e.box@linux.intel.com Link: https://lore.kernel.org/r/20250106174653.1497128-1-david.e.box@linux.intel.c... Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/intel/pmc/core_ssram.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c index 8504154b649f..927f58dc73e3 100644 --- a/drivers/platform/x86/intel/pmc/core_ssram.c +++ b/drivers/platform/x86/intel/pmc/core_ssram.c @@ -269,8 +269,12 @@ pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset) /* * The secondary PMC BARS (which are behind hidden PCI devices) * are read from fixed offsets in MMIO of the primary PMC BAR. + * If a device is not present, the value will be 0. */ ssram_base = get_base(tmp_ssram, offset); + if (!ssram_base) + return 0; + ssram = ioremap(ssram_base, SSRAM_HDR_SIZE); if (!ssram) return -ENOMEM;