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Break poll() to make it match the Xserver's broken expectations.

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Jon Smirl 2004-10-28 15:52:31 +00:00
parent 486a84d70c
commit b974e2cd68
1 changed files with 6 additions and 5 deletions
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11
linux-core/drm_fops.c
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@ -472,14 +472,15 @@ EXPORT_SYMBOL(drm_release);
/** No-op. */ /** No-op. */
/* This is to deal with older X servers that believe 0 means data is /* This is to deal with older X servers that believe 0 means data is
* available which is not the correct return for a poll function. * available which is not the correct return for a poll function.
* By alternating returns both interfaces are happy. This is fixed * This cannot be fixed until the Xserver is fixed. Xserver will need
* in newer X servers. * to set a newer interface version to avoid breaking older Xservers.
* Without fixing the Xserver you get: "WaitForSomething(): select: errno=22"
* http://freedesktop.org/bugzilla/show_bug.cgi?id=1505 if you try
* to return the correct response.
*/ */
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
{ {
static int flip; /* return (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM); */
if ((flip = !flip))
return (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM);
return 0; return 0;
} }
EXPORT_SYMBOL(drm_poll); EXPORT_SYMBOL(drm_poll);