powerpc/32: Fix csum_partial_copy_generic()
Commit7aef413656
("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") introduced a bug when destination address is odd and initial csum is not null In that (rare) case the initial csum value has to be rotated one byte as well as the resulting value is This patch also fixes related comments Fixes:7aef413656
("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -127,8 +127,9 @@ _GLOBAL(csum_partial_copy_generic)
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stw r7,12(r1)
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stw r8,8(r1)
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andi. r0,r4,1 /* is destination address even ? */
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cmplwi cr7,r0,0
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rlwinm r0,r4,3,0x8
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rlwnm r6,r6,r0,0,31 /* odd destination address: rotate one byte */
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cmplwi cr7,r0,0 /* is destination address even ? */
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addic r12,r6,0
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addi r6,r4,-4
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neg r0,r4
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@ -237,7 +238,7 @@ _GLOBAL(csum_partial_copy_generic)
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66: addze r3,r12
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addi r1,r1,16
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beqlr+ cr7
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rlwinm r3,r3,8,0,31 /* swap bytes for odd destination */
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rlwinm r3,r3,8,0,31 /* odd destination address: rotate one byte */
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blr
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/* read fault */
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