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authorAlan Jenkins <alan-jenkins@tuffmail.co.uk>2008-11-01 11:05:26 +0000
committerLen Brown <len.brown@intel.com>2008-11-11 18:34:06 -0500
commitf8248434e6a11d7cd314281be3b39bbcf82fc243 (patch)
treec056e1185944da12dd31a74ee280a89989764ec7 /drivers/acpi/ec.c
parent1cfe62c8010ac56e1bd3827e30386a87cc2f3594 (diff)
ACPI: EC: make kernel messages more useful when GPE storm is detected
Make sure we can tell if the GPE storm workaround gets activated, and avoid flooding the logs afterwards. http://bugzilla.kernel.org/show_bug.cgi?id=11841 "plenty of line "ACPI: EC: non-query interrupt received, switching to interrupt mode" in dmesg" Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Acked-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r--drivers/acpi/ec.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 3ef5b796a68..b340e08cf1d 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -286,7 +286,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
} else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
t->irq_count > ACPI_EC_STORM_THRESHOLD) {
- pr_debug(PREFIX "GPE storm detected\n");
+ pr_info(PREFIX "GPE storm detected, "
+ "transactions will use polling mode\n");
set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
}
return ret;
@@ -566,9 +567,15 @@ static u32 acpi_ec_gpe_handler(void *data)
if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
!test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
/* this is non-query, must be confirmation */
- if (printk_ratelimit())
- pr_info(PREFIX "non-query interrupt received,"
+ if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
+ if (printk_ratelimit())
+ pr_info(PREFIX "non-query interrupt received,"
+ " switching to interrupt mode\n");
+ } else {
+ /* hush, STORM switches the mode every transaction */
+ pr_debug(PREFIX "non-query interrupt received,"
" switching to interrupt mode\n");
+ }
set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
}
return ACPI_INTERRUPT_HANDLED;