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| author | Armin Wolf <W_Armin@gmx.de> | 2024-05-22 23:36:48 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-05-27 12:43:29 +0200 |
| commit | f6f172dc6a6d7775b2df6adfd1350700e9a847ec (patch) | |
| tree | 0ee152587a5c63e9631908a238e08e4f44137dfa | |
| parent | mm: percpu: Include smp.h in alloc_tag.h (diff) | |
| download | linux-f6f172dc6a6d7775b2df6adfd1350700e9a847ec.tar.xz linux-f6f172dc6a6d7775b2df6adfd1350700e9a847ec.zip | |
ACPI: EC: Abort address space access upon error
When a multi-byte address space access is requested, acpi_ec_read()/
acpi_ec_write() is being called multiple times.
Abort such operations if a single call to acpi_ec_read() /
acpi_ec_write() fails, as the data read from / written to the EC
might be incomplete.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/ec.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index e7793ee9e649..a68dce2147a4 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1333,10 +1333,13 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, if (ec->busy_polling || bits > 8) acpi_ec_burst_enable(ec); - for (i = 0; i < bytes; ++i, ++address, ++value) + for (i = 0; i < bytes; ++i, ++address, ++value) { result = (function == ACPI_READ) ? acpi_ec_read(ec, address, value) : acpi_ec_write(ec, address, *value); + if (result < 0) + break; + } if (ec->busy_polling || bits > 8) acpi_ec_burst_disable(ec); |