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rslib: Fix handling of of caller provided syndrome
Check if the syndrome provided by the caller is zero, and act accordingly. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-6-ferdinand.blomqvist@gmail.com
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@ -42,8 +42,18 @@
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BUG_ON(pad < 0 || pad >= nn - nroots);
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/* Does the caller provide the syndrome ? */
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if (s != NULL)
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goto decode;
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if (s != NULL) {
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for (i = 0; i < nroots; i++) {
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/* The syndrome is in index form,
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* so nn represents zero
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*/
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if (s[i] != nn)
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goto decode;
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}
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/* syndrome is zero, no errors to correct */
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return 0;
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}
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/* form the syndromes; i.e., evaluate data(x) at roots of
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* g(x) */
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