diff options
| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2009-08-27 01:45:39 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-09-24 15:12:47 +1000 |
| commit | 254be490f257fc3f76ca5f869ac8d107b3827025 (patch) | |
| tree | 8ef8b4540f54600e3f5cb0f82b7922b53b467278 /drivers/char | |
| parent | 94a8d5caba74211ec76dac80fc6e2d5c391530df (diff) | |
| download | lwn-254be490f257fc3f76ca5f869ac8d107b3827025.tar.gz lwn-254be490f257fc3f76ca5f869ac8d107b3827025.zip | |
hvc_console: Provide (un)locked version for hvc_resize()
Rename the locking free hvc_resize() function to __hvc_resize() and
provide an inline function that locks the hvc_struct and calls
__hvc_resize().
The rationale for this patch is that virtio_console calls the hvc_resize()
function without locking the hvc_struct. So it needs to call the lock
itself.
According to naming rules, the unlocked version is renamed and
prefixed with "__".
References to unlocked function calls in hvc back-ends has been updated.
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/hvc_console.c | 6 | ||||
| -rw-r--r-- | drivers/char/hvc_console.h | 12 | ||||
| -rw-r--r-- | drivers/char/hvc_iucv.c | 4 |
3 files changed, 17 insertions, 5 deletions
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c index 25ce15bb1c08..a632f25f144a 100644 --- a/drivers/char/hvc_console.c +++ b/drivers/char/hvc_console.c @@ -678,7 +678,7 @@ int hvc_poll(struct hvc_struct *hp) EXPORT_SYMBOL_GPL(hvc_poll); /** - * hvc_resize() - Update terminal window size information. + * __hvc_resize() - Update terminal window size information. * @hp: HVC console pointer * @ws: Terminal window size structure * @@ -687,12 +687,12 @@ EXPORT_SYMBOL_GPL(hvc_poll); * * Locking: Locking free; the function MUST be called holding hp->lock */ -void hvc_resize(struct hvc_struct *hp, struct winsize ws) +void __hvc_resize(struct hvc_struct *hp, struct winsize ws) { hp->ws = ws; schedule_work(&hp->tty_resize); } -EXPORT_SYMBOL_GPL(hvc_resize); +EXPORT_SYMBOL_GPL(__hvc_resize); /* * This kthread is either polling or interrupt driven. This is determined by diff --git a/drivers/char/hvc_console.h b/drivers/char/hvc_console.h index 3c85d78c975c..10950ca706d8 100644 --- a/drivers/char/hvc_console.h +++ b/drivers/char/hvc_console.h @@ -28,6 +28,7 @@ #define HVC_CONSOLE_H #include <linux/kref.h> #include <linux/tty.h> +#include <linux/spinlock.h> /* * This is the max number of console adapters that can/will be found as @@ -88,7 +89,16 @@ int hvc_poll(struct hvc_struct *hp); void hvc_kick(void); /* Resize hvc tty terminal window */ -extern void hvc_resize(struct hvc_struct *hp, struct winsize ws); +extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws); + +static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws) +{ + unsigned long flags; + + spin_lock_irqsave(&hp->lock, flags); + __hvc_resize(hp, ws); + spin_unlock_irqrestore(&hp->lock, flags); +} /* default notifier for irq based notification */ extern int notifier_add_irq(struct hvc_struct *hp, int data); diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c index 0ecac7e532f6..b8a5d654d3d0 100644 --- a/drivers/char/hvc_iucv.c +++ b/drivers/char/hvc_iucv.c @@ -273,7 +273,9 @@ static int hvc_iucv_write(struct hvc_iucv_private *priv, case MSG_TYPE_WINSIZE: if (rb->mbuf->datalen != sizeof(struct winsize)) break; - hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data)); + /* The caller must ensure that the hvc is locked, which + * is the case when called from hvc_iucv_get_chars() */ + __hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data)); break; case MSG_TYPE_ERROR: /* ignored ... */ |