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mailbox: pcc: Use acpi_os_ioremap() instead of ioremap()

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[ Upstream commit d181acea5b864e91f38f5771b8961215ce5017ae ]

The Platform Communication Channel (PCC) mailbox driver currently uses
ioremap() to map channel shared memory regions. However it is preferred
to use acpi_os_ioremap(), which is mapping function specific to EFI/ACPI
defined memory regions. It ensures that the correct memory attributes
are applied when mapping ACPI-provided regions.

While at it, also add checks for handling any errors with the mapping.

Acked-by: Huisong Li <lihuisong@huawei.com>
Tested-by: Huisong Li <lihuisong@huawei.com>
Tested-by: Adam Young <admiyo@os.amperecomputing.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sudeep Holla
2025-03-13 15:28:51 +00:00
committed by Greg Kroah-Hartman
parent 7d5b227875
commit 5641f6b3a4
1 changed files with 6 additions and 2 deletions
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8
drivers/mailbox/pcc.c
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@@ -419,8 +419,12 @@ int pcc_mbox_ioremap(struct mbox_chan *chan)
return -1;
pchan_info = chan->con_priv;
pcc_mbox_chan = &pchan_info->chan;
pcc_mbox_chan->shmem = ioremap(pcc_mbox_chan->shmem_base_addr,
pcc_mbox_chan->shmem_size);
pcc_mbox_chan->shmem = acpi_os_ioremap(pcc_mbox_chan->shmem_base_addr,
pcc_mbox_chan->shmem_size);
if (!pcc_mbox_chan->shmem)
return -ENXIO;
return 0;
}
EXPORT_SYMBOL_GPL(pcc_mbox_ioremap);