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gpu: host1x: Add locking in channel allocation

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Add locking around channel allocation to avoid race conditions.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230901111510.663401-1-cyndis@kapsi.fi
This commit is contained in:
Mikko Perttunen 2023-09-01 14:15:07 +03:00 committed by Thierry Reding
parent f170bed50f
commit 9764723de6
2 changed files with 10 additions and 0 deletions
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7
drivers/gpu/host1x/channel.c
View File

@ -27,6 +27,8 @@ int host1x_channel_list_init(struct host1x_channel_list *chlist,
return -ENOMEM;
}
mutex_init(&chlist->lock);
return 0;
}
@ -104,8 +106,11 @@ static struct host1x_channel *acquire_unused_channel(struct host1x *host)
unsigned int max_channels = host->info->nb_channels;
unsigned int index;
mutex_lock(&chlist->lock);
index = find_first_zero_bit(chlist->allocated_channels, max_channels);
if (index >= max_channels) {
mutex_unlock(&chlist->lock);
dev_err(host->dev, "failed to find free channel\n");
return NULL;
}
@ -114,6 +119,8 @@ static struct host1x_channel *acquire_unused_channel(struct host1x *host)
set_bit(index, chlist->allocated_channels);
mutex_unlock(&chlist->lock);
return &chlist->channels[index];
}

3
drivers/gpu/host1x/channel.h
View File

@ -10,6 +10,7 @@
#include <linux/io.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include "cdma.h"
@ -18,6 +19,8 @@ struct host1x_channel;
struct host1x_channel_list {
struct host1x_channel *channels;
struct mutex lock;
unsigned long *allocated_channels;
};