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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-10-03 11:12:25 +0400 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2014-10-07 09:01:18 +0400 |
| commit | bf7588a0859580a45c63cb082825d77c13eca357 (patch) | |
| tree | 135be483b54c55629ed035347a05d788d87f4e3a /arch/powerpc | |
| parent | 75d43b2d0a323ba894d85060888f039e41b441ca (diff) | |
| download | linux-bf7588a0859580a45c63cb082825d77c13eca357.tar.xz | |
powerpc/powernv: Fix endian bug in LPC bus debugfs accessors
When reading from the LPC, the OPAL FW calls return the value via pointer
to a uint32_t which is always returned big endian. Our internal inb/outb
implementation byteswaps that fine but our debugfs code is still broken.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-lpc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-lpc.c b/arch/powerpc/platforms/powernv/opal-lpc.c index ad4b31df779a..dd2c285ad170 100644 --- a/arch/powerpc/platforms/powernv/opal-lpc.c +++ b/arch/powerpc/platforms/powernv/opal-lpc.c @@ -191,6 +191,7 @@ static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf, { struct lpc_debugfs_entry *lpc = filp->private_data; u32 data, pos, len, todo; + __be32 bedata; int rc; if (!access_ok(VERIFY_WRITE, ubuf, count)) @@ -213,9 +214,10 @@ static ssize_t lpc_debug_read(struct file *filp, char __user *ubuf, len = 2; } rc = opal_lpc_read(opal_lpc_chip_id, lpc->lpc_type, pos, - &data, len); + &bedata, len); if (rc) return -ENXIO; + data = be32_to_cpu(bedata); switch(len) { case 4: rc = __put_user((u32)data, (u32 __user *)ubuf); |