Revert "Move xen patchset to new version's subdir."

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.fixes / parport-mutex

diff --git a/src/patches/suse-2.6.27.31/patches.fixes/parport-mutex b/src/patches/suse-2.6.27.31/patches.fixes/parport-mutex
deleted file mode 100644 (file)
index 908b8fa..0000000
--- a/src/patches/suse-2.6.27.31/patches.fixes/parport-mutex
+++ /dev/null
@@ -1,41 +0,0 @@
-From: salina@us.ibm.com
-Subject: No lp_release_parport while write is going on
-References: 62947 - LTC11483
-
-This patch was done by IBM a while back, but apparently never made it
-into mainline. It fixes a problem in the lp driver that can cause oopses.
-
-Scenario:
- process A:    calls lp_write, which in turn calls parport_ieee1284_write_compat,
-               and that invokes parport_wait_peripheral
- process B:    meanwhile does an ioctl(LPGETSTATUS), which call lp_release_parport
-               when done. This function will set physport->cad = NULL.
- process A:    parport_wait_peripheral tries to dereference physport->cad and
-               dies
-
-The patch below simply protects that code with the port_mutex in order to
-protect against simultaneous calls to lp_read/lp_write.
-
-Similar protection is probably required for ioctl(LPRESET).
-
-Signed-off-by: okir@suse.de
-
----
- drivers/char/lp.c |    3 +++
- 1 file changed, 3 insertions(+)
-
---- a/drivers/char/lp.c
-+++ b/drivers/char/lp.c
-@@ -626,9 +626,12 @@ static int lp_ioctl(struct inode *inode,
-                               return -EFAULT;
-                       break;
-               case LPGETSTATUS:
-+                      if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
-+                              return -EINTR;
-                       lp_claim_parport_or_block (&lp_table[minor]);
-                       status = r_str(minor);
-                       lp_release_parport (&lp_table[minor]);
-+                      mutex_unlock(&lp_table[minor].port_mutex);
- 
-                       if (copy_to_user(argp, &status, sizeof(int)))
-                               return -EFAULT;