NTB: ntb_tool: reading the link file should not end in a NULL byte
[ Upstream commit5.4-rM2-2.2.x-imx-squashed912e12813d
] When running ntb_test this warning is issued: ./ntb_test.sh: line 200: warning: command substitution: ignored null byte in input This is caused by the kernel returning one more byte than is necessary when reading the link file. Reduce the number of bytes read back to 2 as it was before the commit that regressed this. Fixes:7f46c8b3a5
("NTB: ntb_tool: Add full multi-port NTB API support") Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Allen Hubbe <allenbh@gmail.com> Tested-by: Alexander Fomichev <fomichev.ru@gmail.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -504,7 +504,7 @@ static ssize_t tool_peer_link_read(struct file *filep, char __user *ubuf,
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buf[1] = '\n';
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buf[2] = '\0';
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return simple_read_from_buffer(ubuf, size, offp, buf, 3);
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return simple_read_from_buffer(ubuf, size, offp, buf, 2);
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}
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static TOOL_FOPS_RDWR(tool_peer_link_fops,
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@ -1690,4 +1690,3 @@ static void __exit tool_exit(void)
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debugfs_remove_recursive(tool_dbgfs_topdir);
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}
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module_exit(tool_exit);
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