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authorKim Phillips <kim.phillips@freescale.com>2011-10-21 15:20:28 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2011-10-21 15:20:28 +0200
commit3e721aeb3df3816e283ab18e327cd4652972e213 (patch)
treeea6fbc0353eea5b5daf5850f60ab49e394ac5670 /drivers/crypto/talitos.c
parente6ea64ece7f4c14294b2fce5403b1e71eab87f1e (diff)
downloadlinux-linaro-stable-3e721aeb3df3816e283ab18e327cd4652972e213.tar.gz
crypto: talitos - handle descriptor not found in error path
The CDPR (Current Descriptor Pointer Register) can be unreliable when trying to locate an offending descriptor. Handle that case by (a) not OOPSing, and (b) reverting to the machine internal copy of the descriptor header in order to report the correct execution unit error. Note: printing all execution units' ISRs is not effective because it results in an internal time out (ITO) error and the EU resetting its ISR value (at least when specifying an invalid key length on an SEC 2.2/MPC8313E). Reported-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/talitos.c')
-rw-r--r--drivers/crypto/talitos.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 8a0bb417aa11..dbe76b5df9cf 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -416,7 +416,7 @@ static void talitos_done(unsigned long data)
/*
* locate current (offending) descriptor
*/
-static struct talitos_desc *current_desc(struct device *dev, int ch)
+static u32 current_desc_hdr(struct device *dev, int ch)
{
struct talitos_private *priv = dev_get_drvdata(dev);
int tail = priv->chan[ch].tail;
@@ -428,23 +428,25 @@ static struct talitos_desc *current_desc(struct device *dev, int ch)
tail = (tail + 1) & (priv->fifo_len - 1);
if (tail == priv->chan[ch].tail) {
dev_err(dev, "couldn't locate current descriptor\n");
- return NULL;
+ return 0;
}
}
- return priv->chan[ch].fifo[tail].desc;
+ return priv->chan[ch].fifo[tail].desc->hdr;
}
/*
* user diagnostics; report root cause of error based on execution unit status
*/
-static void report_eu_error(struct device *dev, int ch,
- struct talitos_desc *desc)
+static void report_eu_error(struct device *dev, int ch, u32 desc_hdr)
{
struct talitos_private *priv = dev_get_drvdata(dev);
int i;
- switch (desc->hdr & DESC_HDR_SEL0_MASK) {
+ if (!desc_hdr)
+ desc_hdr = in_be32(priv->reg + TALITOS_DESCBUF(ch));
+
+ switch (desc_hdr & DESC_HDR_SEL0_MASK) {
case DESC_HDR_SEL0_AFEU:
dev_err(dev, "AFEUISR 0x%08x_%08x\n",
in_be32(priv->reg + TALITOS_AFEUISR),
@@ -488,7 +490,7 @@ static void report_eu_error(struct device *dev, int ch,
break;
}
- switch (desc->hdr & DESC_HDR_SEL1_MASK) {
+ switch (desc_hdr & DESC_HDR_SEL1_MASK) {
case DESC_HDR_SEL1_MDEUA:
case DESC_HDR_SEL1_MDEUB:
dev_err(dev, "MDEUISR 0x%08x_%08x\n",
@@ -550,7 +552,7 @@ static void talitos_error(unsigned long data, u32 isr, u32 isr_lo)
if (v_lo & TALITOS_CCPSR_LO_IEU)
dev_err(dev, "invalid execution unit error\n");
if (v_lo & TALITOS_CCPSR_LO_EU)
- report_eu_error(dev, ch, current_desc(dev, ch));
+ report_eu_error(dev, ch, current_desc_hdr(dev, ch));
if (v_lo & TALITOS_CCPSR_LO_GB)
dev_err(dev, "gather boundary error\n");
if (v_lo & TALITOS_CCPSR_LO_GRL)