The patch titled
eeprom/at25: bugfix "not ready" timeout after write
has been added to the -mm tree. Its filename is
eeprom-at25-bugfix-not-ready-timeout-after-write.patch
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------------------------------------------------------
Subject: eeprom/at25: bugfix "not ready" timeout after write
From: Sebastian Heutling <heutling@xxxxxxxxxx>
Under certain circumstances msleep(1) within the loop, which waits for the
EEPROM to be finished, might take longer than the timeout. On the next
loop the status register might now return to be ready and therefore the
loop finishes. The following check now tests if a timeout occurred and if
so returns an error although the device reported it was ready.
This fix replaces testing the occurrence of the timeout by testing the
"not ready" bit in the status register.
Signed-off-by: Sebastian Heutling <heutling@xxxxxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/misc/eeprom/at25.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN drivers/misc/eeprom/at25.c~eeprom-at25-bugfix-not-ready-timeout-after-write drivers/misc/eeprom/at25.c
--- a/drivers/misc/eeprom/at25.c~eeprom-at25-bugfix-not-ready-timeout-after-write
+++ a/drivers/misc/eeprom/at25.c
@@ -173,6 +173,7 @@ at25_ee_write(struct at25_data *at25, co
unsigned segment;
unsigned offset = (unsigned) off;
u8 *cp = bounce + 1;
+ int sr;
*cp = AT25_WREN;
status = spi_write(at25->spi, cp, 1);
@@ -214,7 +215,6 @@ at25_ee_write(struct at25_data *at25, co
timeout = jiffies + msecs_to_jiffies(EE_TIMEOUT);
retries = 0;
do {
- int sr;
sr = spi_w8r8(at25->spi, AT25_RDSR);
if (sr < 0 || (sr & AT25_SR_nRDY)) {
@@ -228,7 +228,7 @@ at25_ee_write(struct at25_data *at25, co
break;
} while (retries++ < 3 || time_before_eq(jiffies, timeout));
- if (time_after(jiffies, timeout)) {
+ if ((sr < 0) || (sr & AT25_SR_nRDY)) {
dev_err(&at25->spi->dev,
"write %d bytes offset %d, "
"timeout after %u msecs\n",
_
Patches currently in -mm which might be from heutling@xxxxxxxxxx are
eeprom-at25-bugfix-not-ready-timeout-after-write.patch
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