spufs: make signal-notification files readonly for NOSCHED contexts
Reading from the signal{1,2} files requires a spu_acquire_saved, so make these files write-only for contexts created with SPU_CREATE_NOSCHED. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -941,6 +941,13 @@ static const struct file_operations spufs_signal1_nosched_fops = {
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.mmap = spufs_signal1_mmap,
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};
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static const struct file_operations spufs_signal1_nosched_fops = {
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.open = spufs_signal1_open,
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.release = spufs_signal1_release,
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.write = spufs_signal1_write,
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.mmap = spufs_signal1_mmap,
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};
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static int spufs_signal2_open(struct inode *inode, struct file *file)
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{
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struct spufs_inode_info *i = SPUFS_I(inode);
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@ -1076,6 +1083,13 @@ static const struct file_operations spufs_signal2_nosched_fops = {
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.mmap = spufs_signal2_mmap,
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};
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static const struct file_operations spufs_signal2_nosched_fops = {
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.open = spufs_signal2_open,
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.release = spufs_signal2_release,
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.write = spufs_signal2_write,
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.mmap = spufs_signal2_mmap,
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};
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static void spufs_signal1_type_set(void *data, u64 val)
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{
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struct spu_context *ctx = data;
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@ -2177,8 +2191,8 @@ struct tree_descr spufs_dir_contents[] = {
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{ "mbox_stat", &spufs_mbox_stat_fops, 0444, },
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{ "ibox_stat", &spufs_ibox_stat_fops, 0444, },
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{ "wbox_stat", &spufs_wbox_stat_fops, 0444, },
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{ "signal1", &spufs_signal1_fops, 0666, },
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{ "signal2", &spufs_signal2_fops, 0666, },
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{ "signal1", &spufs_signal1_nosched_fops, 0222, },
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{ "signal2", &spufs_signal2_nosched_fops, 0222, },
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{ "signal1_type", &spufs_signal1_type, 0666, },
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{ "signal2_type", &spufs_signal2_type, 0666, },
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{ "cntl", &spufs_cntl_fops, 0666, },
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