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authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>2020-11-24 04:33:17 +0300
committerVinod Koul <vkoul@kernel.org>2020-11-25 08:02:26 +0300
commitb35991de7a59a06a4ea5aee90b4926f01a72f71b (patch)
tree0609d5fa60dd80849394b658029f559cc0b9ee27 /drivers/soundwire/bus.c
parent2fb94784952e4b290c392b74c2c67b4afa672523 (diff)
downloadlinux-b35991de7a59a06a4ea5aee90b4926f01a72f71b.tar.xz
soundwire: bus: only clear valid DP0 interrupts
We should only access the fields that are relevant for DP0, and never write to reserved or read-only SDCA_CASCADE fields. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20201124013318.8963-5-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire/bus.c')
-rw-r--r--drivers/soundwire/bus.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index d6e646521819..f66a804f9b74 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -1280,7 +1280,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave)
static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
{
- u8 clear = 0, impl_int_mask;
+ u8 clear, impl_int_mask;
int status, status2, ret, count = 0;
status = sdw_read(slave, SDW_DP0_INT);
@@ -1291,6 +1291,8 @@ static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
}
do {
+ clear = status & ~SDW_DP0_INTERRUPTS;
+
if (status & SDW_DP0_INT_TEST_FAIL) {
dev_err(&slave->dev, "Test fail for port 0\n");
clear |= SDW_DP0_INT_TEST_FAIL;
@@ -1319,7 +1321,7 @@ static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
*slave_status = clear;
}
- /* clear the interrupt */
+ /* clear the interrupts but don't touch reserved and SDCA_CASCADE fields */
ret = sdw_write(slave, SDW_DP0_INT, clear);
if (ret < 0) {
dev_err(slave->bus->dev,
@@ -1340,7 +1342,7 @@ static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
count++;
/* we can get alerts while processing so keep retrying */
- } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
+ } while ((status & SDW_DP0_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
if (count == SDW_READ_INTR_CLEAR_RETRY)
dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read\n");