dvb/bt8xx: kill the big kernel lock
The bt8xx driver only uses the big kernel lock in its dst_ca_ioctl function and never to serialize against other code, so we can trivially replace it with a private mutex. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: linux-media@vger.kernel.org Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
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@ -22,7 +22,7 @@
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/dvb/ca.h>
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#include "dvbdev.h"
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@ -52,6 +52,7 @@
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} while(0)
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static DEFINE_MUTEX(dst_ca_mutex);
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static unsigned int verbose = 5;
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module_param(verbose, int, 0644);
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MODULE_PARM_DESC(verbose, "verbose startup messages, default is 1 (yes)");
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@ -564,7 +565,7 @@ static long dst_ca_ioctl(struct file *file, unsigned int cmd, unsigned long ioct
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void __user *arg = (void __user *)ioctl_arg;
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int result = 0;
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lock_kernel();
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mutex_lock(&dst_ca_mutex);
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dvbdev = file->private_data;
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state = (struct dst_state *)dvbdev->priv;
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p_ca_message = kmalloc(sizeof (struct ca_msg), GFP_KERNEL);
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@ -652,7 +653,7 @@ static long dst_ca_ioctl(struct file *file, unsigned int cmd, unsigned long ioct
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kfree (p_ca_slot_info);
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kfree (p_ca_caps);
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unlock_kernel();
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mutex_unlock(&dst_ca_mutex);
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return result;
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}
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